Observational constraints on phantom-like braneworld cosmologies

Details Observational constraints on phantom-like braneworld cosmologies Observational constraints on phantom-like braneworld cosmologies

2006-05-29

arxiv.org/abs/astro-ph/0605701v2

Phys.Rev. D74 (2006) 083510

Astronomy and Astrophysics

Astrophysics

small improvements; matches the version to appear in Phys Rev D

Scientific paper

10.1103/PhysRevD.74.083510

We investigate a simple braneworld model in which the universe contains only cold dark matter and a cosmological constant, but the effective dark energy is phantom-like because of extra-dimensional gravity effects. Modified gravity screens the cosmological constant Lambda, allowing for a larger Lambda. In practice, observations do not favour any significant screening. We use supernova data, the cosmic microwave background shift parameter, and the baryon oscillation peak in the galaxy distribution to constrain the model. We find the mean value of Omega_m with 68% confidence limits, and an upper limit on Omega_Lambda at the 68% confidence level. The best-fit model is very close to a standard LCDM model, but the LCDM model provides a better fit since it has one less parameter.

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